It took alot of effort to open the trap. The key is a device to torment us. The concept seems reasonable. The strength energy and persistence needed is not reasonable. Today I will attempt to open a box with a dead chipmunk in it. I will have to clutch it tightly in my arm while using all of my might to open the trap. I'm not trying to get rid of chipmunks. The rat left on it's own accord. What to do with the large container of poison? Oh my. The T Rex insert was probably all that I needed. The trap is effective and definitely a good trap. I do wish I hadn't bought the bait, or they had a small quantity. If you have the TRex insert, you only need peanut butter.